The most unique aspect of planning during the Indus Valley civilization was the system of underground drainage. The main sewer, 1.5 meters deep and 91 cm across, connected to many north-south and east-west sewers.
Ancient Indus civilization sanitation related facilities.
An elaborate sanitary and drainage system, a hallmark of ancient Indus cities, is in evidence everywhere at Lothal.
The proximity of the seat of power to the warehouse may have ensured that the ruler and his entourage could inspect stocks easily. An ivory workshop in the acropolis suggests that elephants may have been domesticated to produce the raw material.
Near the warehouse, also on a high plinth, is the upper town or acropolis which spans 128 by 61 meters and has extensive drainage systems.
Many of the buildings at Mohenjo-daro had two or more stories. Water from the roof and upper storey bathrooms was carried through enclosed terracotta pipes or open chutes that emptied out onto the street, such as this one on a house in DK-G Area.
A bathing platform in UM area with blocked up doorway leading into the room. The brick floor was made with carefully fitted flat paved bricks and a smaller catchment drain along the side of the platform.
A bathing platform in SD area with brick floor made with flat paved bricks. Many bathing platforms were made with watertight floors constructed with bricks laid on their edge.
This bathing platform is located next to the street, and is made with bricks laid flat. A small drain running along one side of the bathing floor channels dirty water out to the street.